Am I right in thinking you are not on HRT but you are peri and tests have revealed nothing abnormal?
If so you could discuss mirena to thin your lining or BCP to regulate your bleeding, with your GP. If you plan on using Hrt in the future then mirena can act as the progesterone part for you so doesn't need removing.
Some folk on here have had success with these two methods.
I don't know how long it could go on for I'm afraid as my periods just stopped dead ( I had had mirena for contraceptive purposes for some years)
Pollie